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                    Introduction
            
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                    第零章：实验环境说明
            
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                    第一章：独立式可执行程序
            
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                    [安装 nightly rust]
            
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                    使用包管理器 cargo 创建 rust binary 项目
            
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                    移除标准库依赖
            
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                    [移除 runtime 依赖]
            
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                    总结与展望
            
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                    第二章：最小化内核
            
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                    使用目标三元组描述目标平台
            
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                    编译、生成内核镜像
            
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                    使用链接脚本指定内存布局
            
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                    [重写程序入口点 -start]
            
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                    [使用 Qemu 运行内核]
            
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                    封装 SBI 接口
            
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                    [实现格式化输出]
            
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                    总结与展望
            
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                    第三章：中断
            
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                    rv64 中断介绍
            
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                    [手动触发断点中断]
            
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                    程序运行上下文环境
            
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                    [实现上下文环境保存与恢复]
            
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                    [时钟中断]
            
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                    总结与展望
            
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                    第四章：内存管理
            
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                    [物理内存探测与管理]
            
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                    [动态内存分配]
            
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                    总结与展望
            
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                    第五章：内存虚拟化
            
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                    页表：从虚拟内存到物理内存
            
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                    [内核初始映射]
            
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                    内核重映射
            
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                    内核重映射实现之一：页表
            
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        <li class="chapter " data-level="1.7.5" data-path="../chapter5/part5.html">
            
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                    内核重映射实现之二：MemorySet
            
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                    [内核重映射实现之三：完结]
            
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        <li class="chapter " data-level="1.7.7" data-path="../chapter5/part7.html">
            
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                    总结与展望
            
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        <li class="chapter " data-level="1.8" data-path="introduction.html">
            
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                    第六章：内核线程
            
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                    线程状态与保存
            
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                    线程切换
            
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                    内核线程初始化
            
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                    [内核线程创建与切换测试]
            
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                    总结与展望
            
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                    第七章：线程调度
            
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                    线程池与线程管理
            
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                    内核调度线程 idle
            
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                    线程调度之 Round Robin 算法
            
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                    [线程调度测试]
            
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                    总结与展望
            
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                    第八章：进程
            
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                    [编写用户程序]
            
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                    合并内核与应用程序
            
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                    在内核中实现系统调用
            
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                    创建虚拟内存空间
            
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                    [创建进程]
            
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                    总结与展望
            
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                    第九章：文件系统
            
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                    [使用文件系统]
            
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                    [实现记事本]
            
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                    [实现终端]
            
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                    [文件读写]
            
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                    总结与展望
            
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                    第十章：同步互斥
            
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                    练习题
            
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                    1. 中断异常
            
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                    2. 物理内存管理
            
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                    3. 虚拟内存管理
            
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                    4. 线程管理
            
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                    5. 用户进程（+ 虚拟内存管理 + 线程管理）
            
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                    6. CPU 调度
            
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                    7. 同步互斥
            
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        <li class="chapter " data-level="1.13.8" data-path="../exercise/part8.html">
            
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                    8. 文件系统
            
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                    附录
            
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                    内联汇编
            
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        <li class="chapter " data-level="1.14.2" data-path="../appendix/install_rust.html">
            
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                    安装 rust
            
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</ul>
<p>&#x56DE;&#x5FC6;&#x4E00;&#x4E0B;&#x6211;&#x4EEC;&#x5982;&#x4F55;&#x8FDB;&#x884C;&#x542F;&#x52A8;&#x7EBF;&#x7A0B;&#x7684;&#x521D;&#x59CB;&#x5316;&#xFF1F;&#x65E0;&#x975E;&#x4E24;&#x6B65;&#xFF1A;&#x8BBE;&#x7F6E;&#x6808;&#x9876;&#x5730;&#x5740;&#x3001;&#x8DF3;&#x8F6C;&#x5230;&#x5185;&#x6838;&#x5165;&#x53E3;&#x5730;&#x5740;&#x3002;&#x4ECE;&#x800C;&#x53D8;&#x4E3A;&#x542F;&#x52A8;&#x7EBF;&#x7A0B;&#x7684;&#x521D;&#x59CB;&#x72B6;&#x6001;&#xFF0C;&#x5E76;&#x51C6;&#x5907;&#x5F00;&#x59CB;&#x8FD0;&#x884C;&#x3002;</p>
<p>&#x5176;&#x4ED6;&#x7EBF;&#x7A0B;&#x7684;&#x521D;&#x59CB;&#x5316;&#x4E5F;&#x5DEE;&#x4E0D;&#x591A;&#x3002;&#x4E8B;&#x5B9E;&#x4E0A;&#x6211;&#x4EEC;&#x8981;&#x6784;&#x9020;&#x4E00;&#x4E2A;&#x505C;&#x6B62;&#x7684;&#x7EBF;&#x7A0B;&#x72B6;&#x6001;&#xFF0C;&#x4F7F;&#x5F97;&#x4E00;&#x65E6;&#x5176;&#x4ED6;&#x7684;&#x8FDB;&#x7A0B;&#x5207;&#x6362;&#x5230;&#x5B83;&#xFF0C;&#x5C31;&#x7ACB;&#x523B;&#x53D8;&#x4E3A;&#x6211;&#x4EEC;&#x60F3;&#x8981;&#x7684;&#x8BE5;&#x7EBF;&#x7A0B;&#x7684;&#x521D;&#x59CB;&#x72B6;&#x6001;&#xFF0C;&#x5E76;&#x53EF;&#x4EE5;&#x5F80;&#x4E0B;&#x8FD0;&#x884C;&#x3002;</p>
<h3 id="&#x6784;&#x9020;&#x7EBF;&#x7A0B;&#x72B6;&#x6001;&#x4FE1;&#x606F;">&#x6784;&#x9020;&#x7EBF;&#x7A0B;&#x72B6;&#x6001;&#x4FE1;&#x606F;</h3>
<p>&#x9996;&#x5148;&#x662F;&#x8981;&#x65B0;&#x5EFA;&#x4E00;&#x4E2A;&#x5185;&#x6838;&#x6808;&#xFF0C;&#x7136;&#x540E;&#x5728;&#x6808;&#x4E0A;&#x538B;&#x5165;&#x6211;&#x4EEC;&#x7CBE;&#x5FC3;&#x6784;&#x9020;&#x7684;&#x7EBF;&#x7A0B;&#x72B6;&#x6001;&#x4FE1;&#x606F;&#x3002;</p>
<pre class="language-"><code class="lang-rust"><span class="token comment">// src/context.rs</span>
<span class="token keyword">impl</span> <span class="token class-name">ContextContent</span> <span class="token punctuation">{</span>
    <span class="token comment">// &#x4E3A;&#x4E00;&#x4E2A;&#x65B0;&#x5185;&#x6838;&#x7EBF;&#x7A0B;&#x6784;&#x9020;&#x6808;&#x4E0A;&#x7684;&#x521D;&#x59CB;&#x72B6;&#x6001;&#x4FE1;&#x606F;</span>
    <span class="token comment">// &#x5176;&#x5165;&#x53E3;&#x70B9;&#x5730;&#x5740;&#x4E3A; entry &#xFF0C;&#x5176;&#x5185;&#x6838;&#x6808;&#x6808;&#x9876;&#x5730;&#x5740;&#x4E3A; kstack_top &#xFF0C;&#x5176;&#x9875;&#x8868;&#x4E3A; satp</span>
    <span class="token keyword">fn</span> <span class="token function-definition function">new_kernel_thread</span><span class="token punctuation">(</span>
        entry<span class="token punctuation">:</span> <span class="token keyword">usize</span><span class="token punctuation">,</span>
        kstack_top<span class="token punctuation">:</span> <span class="token keyword">usize</span><span class="token punctuation">,</span>
        satp<span class="token punctuation">:</span> <span class="token keyword">usize</span><span class="token punctuation">,</span>
        <span class="token punctuation">)</span> <span class="token punctuation">-&gt;</span> <span class="token class-name">ContextContent</span> <span class="token punctuation">{</span>

        <span class="token keyword">let</span> <span class="token keyword">mut</span> content <span class="token operator">=</span> <span class="token class-name">ContextContent</span> <span class="token punctuation">{</span>
            ra<span class="token punctuation">:</span> __trapret <span class="token keyword">as</span> <span class="token keyword">usize</span><span class="token punctuation">,</span>
            satp<span class="token punctuation">,</span>
            s<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">;</span> <span class="token number">12</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
            tf<span class="token punctuation">:</span> <span class="token punctuation">{</span>
                <span class="token keyword">let</span> <span class="token keyword">mut</span> tf<span class="token punctuation">:</span> <span class="token class-name">TrapFrame</span> <span class="token operator">=</span> <span class="token keyword">unsafe</span> <span class="token punctuation">{</span> <span class="token function">zeroed</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">;</span>
                tf<span class="token punctuation">.</span>x<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span> <span class="token operator">=</span> kstack_top<span class="token punctuation">;</span>
                tf<span class="token punctuation">.</span>sepc <span class="token operator">=</span> entry<span class="token punctuation">;</span>
                tf<span class="token punctuation">.</span>sstatus <span class="token operator">=</span> <span class="token namespace">sstatus<span class="token punctuation">::</span></span><span class="token function">read</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                tf<span class="token punctuation">.</span>sstatus<span class="token punctuation">.</span><span class="token function">set_spp</span><span class="token punctuation">(</span><span class="token namespace">sstatus<span class="token punctuation">::</span></span><span class="token constant">SPP</span><span class="token punctuation">::</span><span class="token class-name">Supervisor</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                tf<span class="token punctuation">.</span>sstatus<span class="token punctuation">.</span><span class="token function">set_spie</span><span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                tf<span class="token punctuation">.</span>sstatus<span class="token punctuation">.</span><span class="token function">set_sie</span><span class="token punctuation">(</span><span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                tf
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span><span class="token punctuation">;</span>
        content
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x9996;&#x5148; <span class="katex"><span class="katex-mathml"><math><semantics><mrow><mtext><mi mathvariant="normal">s</mi><mi mathvariant="normal">a</mi><mi mathvariant="normal">t</mi><mi mathvariant="normal">p</mi></mtext></mrow><annotation encoding="application/x-tex">\text{satp}</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.61508em;"></span><span class="strut bottom" style="height:0.80952em;vertical-align:-0.19444em;"></span><span class="base textstyle uncramped"><span class="mord text textstyle uncramped"><span class="mord mathrm">satp</span></span></span></span></span> &#x5728; <code>switch_to</code> &#x4E2D;&#x88AB;&#x6B63;&#x786E;&#x8BBE;&#x7F6E;&#x3002;&#x8FD9;&#x91CC; <span class="katex"><span class="katex-mathml"><math><semantics><mrow><mtext><mi mathvariant="normal">r</mi><mi mathvariant="normal">a</mi></mtext></mrow><annotation encoding="application/x-tex">\text{ra}</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.43056em;"></span><span class="strut bottom" style="height:0.43056em;vertical-align:0em;"></span><span class="base textstyle uncramped"><span class="mord text textstyle uncramped"><span class="mord mathrm">ra</span></span></span></span></span> &#x7684;&#x503C;&#x4E3A; <code>__trapret</code> &#xFF0C;&#x56E0;&#x6B64;&#x5F53; <code>switch_to</code> &#x4F7F;&#x7528; <code>ret</code> &#x9000;&#x51FA;&#x540E;&#x4F1A;&#x8DF3;&#x8F6C;&#x5230; <code>__trapret</code> &#x3002;&#x800C;&#x5B83;&#x662F;&#x6211;&#x4EEC;&#x5728;&#x4E2D;&#x65AD;&#x5904;&#x7406;&#x8FD4;&#x56DE;&#x65F6;&#x7528;&#x6765;<a href="part4.html">&#x6062;&#x590D;&#x4E2D;&#x65AD;&#x4E0A;&#x4E0B;&#x6587;</a>&#x7684;&#xFF01;&#x5B9E;&#x9645;&#x4E0A;&#x8FD9;&#x91CC;&#x7528; <code>__trapret</code> &#x4EC5;&#x4EC5;&#x662F;&#x5229;&#x7528;&#x5B83;&#x6765;&#x8BBE;&#x7F6E;&#x5BC4;&#x5B58;&#x5668;&#x7684;&#x521D;&#x59CB;&#x503C;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x8BF4;&#x5B83;&#x548C;&#x4E2D;&#x65AD;&#x6709;&#x4EC0;&#x4E48;&#x5173;&#x7CFB;&#x3002;</p>
<p>&#x4ECE; <code>switch_to</code> &#x8FD4;&#x56DE;&#x4E4B;&#x540E;&#xFF0C;&#x539F;&#x6808;&#x9876;&#x7684; <span class="katex"><span class="katex-mathml"><math><semantics><mrow><msub><mtext><mi mathvariant="normal">r</mi><mi mathvariant="normal">a</mi><mi mathvariant="normal">,</mi><mi mathvariant="normal">s</mi><mi mathvariant="normal">a</mi><mi mathvariant="normal">t</mi><mi mathvariant="normal">p</mi><mi mathvariant="normal">,</mi><mi mathvariant="normal">s</mi></mtext><mn>0</mn></msub><mo>&#x223C;</mo><msub><mtext><mi mathvariant="normal">s</mi></mtext><mrow><mn>1</mn><mn>1</mn></mrow></msub></mrow><annotation encoding="application/x-tex">\text{ra,satp,s}_0\sim\text{s}_{11}</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.61508em;"></span><span class="strut bottom" style="height:0.85952em;vertical-align:-0.24444em;"></span><span class="base textstyle uncramped"><span class="mord"><span class="mord text textstyle uncramped"><span class="mord mathrm">ra,satp,s</span></span><span class="msupsub"><span class="vlist"><span style="top:0.24444em;margin-right:0.05em;"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span><span class="reset-textstyle scriptstyle cramped mtight"><span class="mord mathrm mtight">0</span></span></span><span class="baseline-fix"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span>&#x200B;</span></span></span></span><span class="mrel">&#x223C;</span><span class="mord"><span class="mord text textstyle uncramped"><span class="mord mathrm">s</span></span><span class="msupsub"><span class="vlist"><span style="top:0.15em;margin-right:0.05em;"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span><span class="reset-textstyle scriptstyle cramped mtight"><span class="mord scriptstyle cramped mtight"><span class="mord mathrm mtight">1</span><span class="mord mathrm mtight">1</span></span></span></span><span class="baseline-fix"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span>&#x200B;</span></span></span></span></span></span></span> &#x88AB;&#x56DE;&#x6536;&#x6389;&#x4E86;&#x3002;&#x56E0;&#x6B64;&#x73B0;&#x5728;&#x6808;&#x9876;&#x4E0A;&#x6070;&#x597D;&#x4FDD;&#x5B58;&#x4E86;&#x4E00;&#x4E2A;&#x4E2D;&#x65AD;&#x5E27;&#x3002;&#x90A3;&#x4E48;&#x6211;&#x4EEC;&#x4ECE;&#x4E2D;&#x65AD;&#x8FD4;&#x56DE;&#x7684;&#x89C6;&#x89D2;&#x6765;&#x770B;&#x5F85;&#xFF1A;&#x6808;&#x9876;&#x5730;&#x5740;&#x4F1A;&#x88AB;&#x6B63;&#x786E;&#x8BBE;&#x7F6E;&#x4E3A; <code>kstack_top</code> &#xFF0C;&#x7531;&#x4E8E;&#x5C06;&#x4E2D;&#x65AD;&#x5E27;&#x7684; <span class="katex"><span class="katex-mathml"><math><semantics><mrow><mtext><mi mathvariant="normal">s</mi><mi mathvariant="normal">e</mi><mi mathvariant="normal">p</mi><mi mathvariant="normal">c</mi></mtext></mrow><annotation encoding="application/x-tex">\text{sepc}</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.43056em;"></span><span class="strut bottom" style="height:0.625em;vertical-align:-0.19444em;"></span><span class="base textstyle uncramped"><span class="mord text textstyle uncramped"><span class="mord mathrm">sepc</span></span></span></span></span> &#x8BBE;&#x7F6E;&#x4E3A;&#x7EBF;&#x7A0B;&#x5165;&#x53E3;&#x70B9;&#xFF0C;&#x56E0;&#x6B64;&#x4E2D;&#x65AD;&#x8FD4;&#x56DE;&#x540E;&#x4F1A;&#x901A;&#x8FC7; <code>sret</code> &#x8DF3;&#x8F6C;&#x5230;&#x7EBF;&#x7A0B;&#x5165;&#x53E3;&#x70B9;&#x3002;</p>
<p>&#x6CE8;&#x610F;&#x4E2D;&#x65AD;&#x5E27;&#x4E2D; <span class="katex"><span class="katex-mathml"><math><semantics><mrow><mtext><mi mathvariant="normal">s</mi><mi mathvariant="normal">s</mi><mi mathvariant="normal">t</mi><mi mathvariant="normal">a</mi><mi mathvariant="normal">t</mi><mi mathvariant="normal">u</mi><mi mathvariant="normal">s</mi></mtext></mrow><annotation encoding="application/x-tex">\text{sstatus}</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.61508em;"></span><span class="strut bottom" style="height:0.61508em;vertical-align:0em;"></span><span class="base textstyle uncramped"><span class="mord text textstyle uncramped"><span class="mord mathrm">sstatus</span></span></span></span></span> &#x7684;&#x8BBE;&#x7F6E;&#xFF1A;</p>
<ul>
<li>&#x5C06; <span class="katex"><span class="katex-mathml"><math><semantics><mrow><mtext><mi mathvariant="normal">S</mi><mi mathvariant="normal">P</mi><mi mathvariant="normal">P</mi></mtext></mrow><annotation encoding="application/x-tex">\text{SPP}</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.68333em;"></span><span class="strut bottom" style="height:0.68333em;vertical-align:0em;"></span><span class="base textstyle uncramped"><span class="mord text textstyle uncramped"><span class="mord mathrm">SPP</span></span></span></span></span> &#x8BBE;&#x7F6E;&#x4E3A; Supervisor &#xFF0C;&#x4F7F;&#x5F97;&#x4F7F;&#x7528; <code>sret</code> &#x8FD4;&#x56DE;&#x540E; CPU &#x7684;&#x7279;&#x6743;&#x7EA7;&#x4E3A; S Mode &#x3002;</li>
<li>&#x8BBE;&#x7F6E; <span class="katex"><span class="katex-mathml"><math><semantics><mrow><mtext><mi mathvariant="normal">S</mi><mi mathvariant="normal">I</mi><mi mathvariant="normal">E</mi><mi mathvariant="normal">,</mi><mi mathvariant="normal">S</mi><mi mathvariant="normal">P</mi><mi mathvariant="normal">I</mi><mi mathvariant="normal">E</mi></mtext></mrow><annotation encoding="application/x-tex">\text{SIE,SPIE}</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.68333em;"></span><span class="strut bottom" style="height:0.8777699999999999em;vertical-align:-0.19444em;"></span><span class="base textstyle uncramped"><span class="mord text textstyle uncramped"><span class="mord mathrm">SIE,SPIE</span></span></span></span></span>&#xFF0C;&#x8FD9;&#x91CC;&#x7684;&#x4F5C;&#x7528;&#x662F; <code>sret</code> &#x8FD4;&#x56DE;&#x540E;&#xFF0C;&#x5728;&#x5185;&#x6838;&#x7EBF;&#x7A0B;&#x4E2D;&#x4F7F;&#x80FD;&#x5F02;&#x6B65;&#x4E2D;&#x65AD;&#x3002;&#x8BE6;&#x60C5;&#x8BF7;&#x53C2;&#x8003;<a href="https://riscv.org/specifications/privileged-isa/" target="_blank">RISC-V &#x7279;&#x6743;&#x6307;&#x4EE4;&#x96C6;&#x6587;&#x6863;</a>&#x3002;</li>
</ul>
<p>&#x6211;&#x4EEC;&#x8FD8;&#x5E0C;&#x671B;&#x80FD;&#x591F;&#x7ED9;&#x7EBF;&#x7A0B;&#x4F20;&#x5165;&#x53C2;&#x6570;&#xFF0C;&#x8FD9;&#x53EA;&#x9700;&#x8981;&#x4FEE;&#x6539;&#x4E2D;&#x65AD;&#x5E27;&#x4E2D;&#x7684;<span class="katex"><span class="katex-mathml"><math><semantics><mrow><msub><mi>x</mi><mrow><mn>1</mn><mn>0</mn></mrow></msub><mo separator="true">,</mo><msub><mi>x</mi><mrow><mn>1</mn><mn>1</mn></mrow></msub><mo separator="true">,</mo><mi mathvariant="normal">.</mi><mi mathvariant="normal">.</mi><mi mathvariant="normal">.</mi><mo separator="true">,</mo><msub><mi>x</mi><mrow><mn>1</mn><mn>7</mn></mrow></msub></mrow><annotation encoding="application/x-tex">x_{10},x_{11},...,x_{17} </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.43056em;"></span><span class="strut bottom" style="height:0.625em;vertical-align:-0.19444em;"></span><span class="base textstyle uncramped"><span class="mord"><span class="mord mathit">x</span><span class="msupsub"><span class="vlist"><span style="top:0.15em;margin-right:0.05em;margin-left:0em;"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span><span class="reset-textstyle scriptstyle cramped mtight"><span class="mord scriptstyle cramped mtight"><span class="mord mathrm mtight">1</span><span class="mord mathrm mtight">0</span></span></span></span><span class="baseline-fix"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span>&#x200B;</span></span></span></span><span class="mpunct">,</span><span class="mord"><span class="mord mathit">x</span><span class="msupsub"><span class="vlist"><span style="top:0.15em;margin-right:0.05em;margin-left:0em;"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span><span class="reset-textstyle scriptstyle cramped mtight"><span class="mord scriptstyle cramped mtight"><span class="mord mathrm mtight">1</span><span class="mord mathrm mtight">1</span></span></span></span><span class="baseline-fix"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span>&#x200B;</span></span></span></span><span class="mpunct">,</span><span class="mord mathrm">.</span><span class="mord mathrm">.</span><span class="mord mathrm">.</span><span class="mpunct">,</span><span class="mord"><span class="mord mathit">x</span><span class="msupsub"><span class="vlist"><span style="top:0.15em;margin-right:0.05em;margin-left:0em;"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span><span class="reset-textstyle scriptstyle cramped mtight"><span class="mord scriptstyle cramped mtight"><span class="mord mathrm mtight">1</span><span class="mord mathrm mtight">7</span></span></span></span><span class="baseline-fix"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span>&#x200B;</span></span></span></span></span></span></span>&#xFF08;&#x5373;&#x53C2;&#x6570;<span class="katex"><span class="katex-mathml"><math><semantics><mrow><msub><mi>a</mi><mn>0</mn></msub><mo separator="true">,</mo><msub><mi>a</mi><mn>1</mn></msub><mo separator="true">,</mo><mi mathvariant="normal">.</mi><mi mathvariant="normal">.</mi><mi mathvariant="normal">.</mi><mo separator="true">,</mo><msub><mi>a</mi><mn>7</mn></msub></mrow><annotation encoding="application/x-tex">a_0,a_1,...,a_7</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.43056em;"></span><span class="strut bottom" style="height:0.625em;vertical-align:-0.19444em;"></span><span class="base textstyle uncramped"><span class="mord"><span class="mord mathit">a</span><span class="msupsub"><span class="vlist"><span style="top:0.15em;margin-right:0.05em;margin-left:0em;"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span><span class="reset-textstyle scriptstyle cramped mtight"><span class="mord mathrm mtight">0</span></span></span><span class="baseline-fix"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span>&#x200B;</span></span></span></span><span class="mpunct">,</span><span class="mord"><span class="mord mathit">a</span><span class="msupsub"><span class="vlist"><span style="top:0.15em;margin-right:0.05em;margin-left:0em;"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span><span class="reset-textstyle scriptstyle cramped mtight"><span class="mord mathrm mtight">1</span></span></span><span class="baseline-fix"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span>&#x200B;</span></span></span></span><span class="mpunct">,</span><span class="mord mathrm">.</span><span class="mord mathrm">.</span><span class="mord mathrm">.</span><span class="mpunct">,</span><span class="mord"><span class="mord mathit">a</span><span class="msupsub"><span class="vlist"><span style="top:0.15em;margin-right:0.05em;margin-left:0em;"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span><span class="reset-textstyle scriptstyle cramped mtight"><span class="mord mathrm mtight">7</span></span></span><span class="baseline-fix"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span>&#x200B;</span></span></span></span></span></span></span> &#xFF09;&#x5373;&#x53EF;&#xFF0C;<code>__trapret</code> &#x51FD;&#x6570;&#x53EF;&#x4EE5;&#x534F;&#x52A9;&#x5B8C;&#x6210;&#x53C2;&#x6570;&#x4F20;&#x9012;&#x3002;</p>
<pre class="language-"><code class="lang-rust"><span class="token comment">// src/context.rs</span>

<span class="token keyword">impl</span> <span class="token class-name">Context</span> <span class="token punctuation">{</span>
    <span class="token keyword">pub</span> <span class="token keyword">unsafe</span> <span class="token keyword">fn</span> <span class="token function-definition function">new_kernel_thread</span><span class="token punctuation">(</span>
        entry<span class="token punctuation">:</span> <span class="token keyword">usize</span><span class="token punctuation">,</span>
        kstack_top<span class="token punctuation">:</span> <span class="token keyword">usize</span><span class="token punctuation">,</span>
        satp<span class="token punctuation">:</span> <span class="token keyword">usize</span>
        <span class="token punctuation">)</span> <span class="token punctuation">-&gt;</span> <span class="token class-name">Context</span> <span class="token punctuation">{</span>
        <span class="token class-name">ContextContent</span><span class="token punctuation">::</span><span class="token function">new_kernel_thread</span><span class="token punctuation">(</span>entry<span class="token punctuation">,</span> kstack_top<span class="token punctuation">,</span> satp<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">push_at</span><span class="token punctuation">(</span>kstack_top<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">pub</span> <span class="token keyword">unsafe</span> <span class="token keyword">fn</span> <span class="token function-definition function">append_initial_arguments</span><span class="token punctuation">(</span><span class="token operator">&amp;</span><span class="token keyword">self</span><span class="token punctuation">,</span> args<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token keyword">usize</span><span class="token punctuation">;</span> <span class="token number">3</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">let</span> contextContent <span class="token operator">=</span> <span class="token operator">&amp;</span><span class="token keyword">mut</span> <span class="token operator">*</span><span class="token punctuation">(</span><span class="token keyword">self</span><span class="token punctuation">.</span>content_addr <span class="token keyword">as</span> <span class="token operator">*</span><span class="token keyword">mut</span> <span class="token class-name">ContextContent</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        contextContent<span class="token punctuation">.</span>tf<span class="token punctuation">.</span>x<span class="token punctuation">[</span><span class="token number">10</span><span class="token punctuation">]</span> <span class="token operator">=</span> args<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
        contextContent<span class="token punctuation">.</span>tf<span class="token punctuation">.</span>x<span class="token punctuation">[</span><span class="token number">11</span><span class="token punctuation">]</span> <span class="token operator">=</span> args<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
        contextContent<span class="token punctuation">.</span>tf<span class="token punctuation">.</span>x<span class="token punctuation">[</span><span class="token number">12</span><span class="token punctuation">]</span> <span class="token operator">=</span> args<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">impl</span> <span class="token class-name">ContextContent</span> <span class="token punctuation">{</span>
    <span class="token comment">// &#x5C06;&#x81EA;&#x8EAB;&#x538B;&#x5230;&#x6808;&#x4E0A;&#xFF0C;&#x5E76;&#x8FD4;&#x56DE; Context</span>
    <span class="token keyword">unsafe</span> <span class="token keyword">fn</span> <span class="token function-definition function">push_at</span><span class="token punctuation">(</span><span class="token keyword">self</span><span class="token punctuation">,</span> stack_top<span class="token punctuation">:</span> <span class="token keyword">usize</span><span class="token punctuation">)</span> <span class="token punctuation">-&gt;</span> <span class="token class-name">Context</span> <span class="token punctuation">{</span>
        <span class="token keyword">let</span> ptr <span class="token operator">=</span> <span class="token punctuation">(</span>stack_top <span class="token keyword">as</span> <span class="token operator">*</span><span class="token keyword">mut</span> <span class="token class-name">ContextContent</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">sub</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token operator">*</span>ptr <span class="token operator">=</span> <span class="token keyword">self</span><span class="token punctuation">;</span>
        <span class="token class-name">Context</span> <span class="token punctuation">{</span> content_addr<span class="token punctuation">:</span> ptr <span class="token keyword">as</span> <span class="token keyword">usize</span> <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="&#x521B;&#x5EFA;&#x65B0;&#x7EBF;&#x7A0B;">&#x521B;&#x5EFA;&#x65B0;&#x7EBF;&#x7A0B;</h3>
<p>&#x63A5;&#x4E0B;&#x6765;&#x5C31;&#x662F;&#x7EBF;&#x7A0B;&#x7684;&#x521B;&#x5EFA;&#xFF1A;</p>
<pre class="language-"><code class="lang-rust"><span class="token comment">// src/process/structs.rs</span>
<span class="token keyword">impl</span> <span class="token class-name">Thread</span> <span class="token punctuation">{</span>
    <span class="token comment">// &#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x65B0;&#x7EBF;&#x7A0B;&#xFF0C;&#x653E;&#x5728;&#x5806;&#x4E0A;</span>
    <span class="token keyword">pub</span> <span class="token keyword">fn</span> <span class="token function-definition function">new_kernel</span><span class="token punctuation">(</span>entry<span class="token punctuation">:</span> <span class="token keyword">usize</span><span class="token punctuation">)</span> <span class="token punctuation">-&gt;</span> <span class="token class-name">Box</span><span class="token operator">&lt;</span><span class="token class-name">Thread</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">unsafe</span> <span class="token punctuation">{</span>
            <span class="token keyword">let</span> kstack_ <span class="token operator">=</span> <span class="token class-name">KernelStack</span><span class="token punctuation">::</span><span class="token function">new</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token class-name">Box</span><span class="token punctuation">::</span><span class="token function">new</span><span class="token punctuation">(</span><span class="token class-name">Thread</span> <span class="token punctuation">{</span>
                <span class="token comment">// &#x5185;&#x6838;&#x7EBF;&#x7A0B;&#x5171;&#x4EAB;&#x5185;&#x6838;&#x8D44;&#x6E90;&#xFF0C;&#x56E0;&#x6B64;&#x7528;&#x76EE;&#x524D;&#x7684; satp &#x5373;&#x53EF;</span>
                context<span class="token punctuation">:</span> <span class="token class-name">Context</span><span class="token punctuation">::</span><span class="token function">new_kernel_thread</span><span class="token punctuation">(</span>entry<span class="token punctuation">,</span> kstack_<span class="token punctuation">.</span><span class="token function">top</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token namespace">satp<span class="token punctuation">::</span></span><span class="token function">read</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">bits</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> kstack<span class="token punctuation">:</span> kstack_<span class="token punctuation">,</span>
            <span class="token punctuation">}</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token comment">// &#x4E3A;&#x7EBF;&#x7A0B;&#x4F20;&#x5165;&#x521D;&#x59CB;&#x53C2;&#x6570;</span>
    <span class="token keyword">pub</span> <span class="token keyword">fn</span> <span class="token function-definition function">append_initial_arguments</span><span class="token punctuation">(</span><span class="token operator">&amp;</span><span class="token keyword">self</span><span class="token punctuation">,</span> args<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token keyword">usize</span><span class="token punctuation">;</span> <span class="token number">3</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">unsafe</span> <span class="token punctuation">{</span> <span class="token keyword">self</span><span class="token punctuation">.</span>context<span class="token punctuation">.</span><span class="token function">append_initial_arguments</span><span class="token punctuation">(</span>args<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x4E0B;&#x4E00;&#x8282;&#x6211;&#x4EEC;&#x7EC8;&#x4E8E;&#x80FD;&#x62E8;&#x4E91;&#x89C1;&#x65E5;&#xFF0C;&#x5199;&#x4E00;&#x4E2A;&#x6D4B;&#x8BD5;&#x770B;&#x770B;&#x6211;&#x4EEC;&#x7684;&#x7EBF;&#x7A0B;&#x5B9E;&#x73B0;&#x7A76;&#x7ADF;&#x6709;&#x65E0;&#x95EE;&#x9898;&#x4E86;&#xFF01;</p>
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